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Investment in Unconsolidated Entities - Schedule of Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Equity method investments	$ 490		$ 490		$ 459
Measurement alternative method investments	21		21		21
Total investments in unconsolidated entities	511	$ 500	511	$ 500	$ 480
Equity method investments, combined income statements
Revenues	1,721	1,699	5,077	5,023
Operating expenses	1,247	1,234	3,660	3,651
Operating income	474	465	1,417	1,372
Other income (expense), net	(2)	(3)	(4)	(3)
Net income	$ 472	$ 462	$ 1,413	$ 1,369

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The amount other, nonoperating income (loss) reported by an equity method investment of the entity.

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The amount of the cost of sales reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

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